Method and device for transmitting block division information in image codec for security camera

Abstract

The present invention relates to a method and device for transmitting block division information for efficient image coding in a video compression technique for a high-definition security camera. To this end, the present invention obtains block division information from a bitstream, determines the division form of an image by computing and predicting omitted information if there is omitted information in the obtained information, and performs video decoding in the unit of a divided block.

What is claimed is: 
     
       1. A method for decoding a video signal, with a decoding apparatus, comprising:
 determining, with the decoding apparatus, a current block by dividing a coding block, 
 wherein the coding block is divided recursively based on at least one of a quad-division or a binary-division, 
 wherein the quad-division is performed without extracting first division information for the quad-division from a bitstream, and 
 wherein the binary-division is performed by using second division information for the binary-division extracted from the bitstream, the second division information indicating that the binary-division is used or specifying a division direction of the binary-division; 
 obtaining, with the decoding apparatus, quantized coefficients from the bitstream; 
 obtaining, with the decoding apparatus, a residual signal by performing inverse-quantization and inverse-transform on the quantized coefficients; 
 generating, with the decoding apparatus, a prediction signal of the current block by performing intra prediction based on reconstructed pixel values of a neighboring block adjacent to the current block; and 
 reconstructing, with the decoding apparatus, the current block using the residual signal and the prediction signal. 
 
     
     
       2. The method of  claim 1 , wherein the first division information indicates that the coding block is divided into four sub-blocks in horizontal and vertical directions. 
     
     
       3. The method of  claim 1 , wherein the division direction is one of a horizontal direction or a vertical direction. 
     
     
       4. The method of  claim 3 , wherein two sub-blocks obtained by the binary-division are a same size. 
     
     
       5. A method for encoding a video signal, with an encoding apparatus, comprising:
 determining, with the encoding apparatus, a current block by dividing a coding block; 
 generating, with the encoding apparatus, a prediction signal of the current block by performing intra prediction based on reconstructed pixel values of a neighboring block adjacent to the current block; 
 obtaining, with the encoding apparatus, a residual signal of the current block based on the prediction signal; 
 obtaining, with the encoding apparatus, quantized coefficients by performing transform and quantization on the residual signal; and 
 encoding, with the encoding apparatus, the quantized coefficients to generate a bitstream, 
 wherein the coding block is divided recursively based on at least one of a quad-division or a binary-division, 
 wherein first division information for the quad-division is not encoded into the bitstream, and 
 wherein second division information for the binary-division is encoded into the bitstream, the second division information indicating that the binary-division is used or specifying a division direction of the binary-division. 
 
     
     
       6. The method of  claim 5 , wherein the first division information indicates that the coding block is divided into four sub-blocks in horizontal and vertical directions. 
     
     
       7. The method of  claim 5 , wherein the division direction is one of a horizontal direction or a vertical direction. 
     
     
       8. The method of  claim 7 , wherein two sub-blocks obtained by the binary-division are a same size. 
     
     
       9. A transmission method of a video signal with a transmission apparatus, comprising:
 determining, with the transmission apparatus, a current block by dividing a coding block; 
 generating, with the transmission apparatus, a prediction signal of the current block by performing intra prediction based on reconstructed pixel values of a neighboring block adjacent to the current block; 
 obtaining, with the transmission apparatus, a residual signal of the current block based on the prediction signal; 
 obtaining, with the transmission apparatus, quantized coefficients by performing transform and quantization on the residual signal; 
 encoding, with the transmission apparatus, the quantized coefficients to generate a bitstream; and 
 transmitting, with the transmission apparatus, the bitstream including the video signal, 
 wherein the coding block is divided recursively based on at least one of a quad-division or a binary-division, 
 wherein first division information for the quad-division is not encoded into the bitstream, and 
 wherein second division information for the binary-division is encoded into the bitstream, the second division information indicating that the binary-division is used or specifying a division direction of the binary-division. 
 
     
     
       10. The transmission method of  claim 9 , wherein the first division information indicates that the coding block is divided into four sub-blocks in horizontal and vertical directions. 
     
     
       11. The transmission method of  claim 9 , wherein the division direction is one of a horizontal direction or a vertical direction. 
     
     
       12. The transmission method of  claim 11 , wherein two sub-blocks obtained by the binary-division are a same size.